Although a ceasefire is temporarily in effect in war-torn Syria, humanitarian aid has been blocked for days at the Turkish border, leaving thousands of Syrians without many basic needs—like food, for example.

Both the United States and Russia have said they want to extend the ceasefire they initiated, despite spots of continued violence. Both superpowers, however, are distrustful of the other and pointing fingers as to why thousands of pounds of flour, food rations and medical supplies are stalled at the border.

Russia is now accusing a U.S.-led coalition for an airstrike Sunday morning on the Syrian army, killing more than 90 soldiers, according to the Syrian Observatory for Human Rights. Russia’s Foreign Ministry said they hoped the action by the coalition was not an order from Washington D.C. and “strongly urge Washington to exert the needed pressure on the illegal armed groups under its patronage to implement the ceasefire plan unconditionally.”

With the ceasefire on shaky ground, so is the idea of aid getting to Syrian civilians. And it’s needed now more than ever: Pro-Syrian government forces encircled the rebel zone in Aleppo earlier this month, trapping an estimated 300,000 civilians there with no way to bring in food.

The Syrian civil war has killed an estimated 430,000 people since it started five years ago, and more will die if aid continues to be kept from reaching thousands of civilians.—Angie Wierzbicki